S
M
T
W
T
F
S
30
16°
-5°
1
37°
4°
2
42°
24°
3
35°
18°
4
41°
13°
5
42°
26°
6
36°
16°
7
47°
16°
8
53°
28°
9
61°
35°
10
41°
26°
11
44°
32°
12
33°
8°
13
12°
5°
14
57°
10°
15
65°
31°
16
64°
33°
17
64°
34°
18
40°
18°
19
62°
23°
20
44°
19°
21
47°
20°
22
58°
25°
23
58°
30°
24
59°
36°
25
68°
42°
26
64°
32°
27
59°
10°
28
16°
4°
29
42°
4°
30
52°
22°
31
61°
19°
1
60°
19°
2
33°
20°
3
51°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Rapid City
Rapid City's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Rapid City. See also: January | February | March.
